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Running the code below returns a vm error:

Error: Returned error: VM Exception while processing transaction: revert at Object.ErrorResponse (node_modules/truffle/build/webpack:/~/web3-eth/~/web3-core-helpers/src/errors.js:29:1) at node_modules/truffle/build/webpack:/~/web3-eth/~/web3-core-requestmanager/src/index.js:140:1 at node_modules/truffle/build/webpack:/packages/truffle-provider/wrapper.js:112:1 at XMLHttpRequest.request.onreadystatechange (node_modules/truffle/build/webpack:/~/web3/~/web3-providers-http/src/index.js:96:1) at XMLHttpRequestEventTarget.dispatchEvent (node_modules/truffle/build/webpack:/~/xhr2-cookies/dist/xml-http-request-event-target.js:34:1) at XMLHttpRequest._setReadyState (node_modules/truffle/build/webpack:/~/xhr2-cookies/dist/xml-http-request.js:208:1) at XMLHttpRequest._onHttpResponseEnd (node_modules/truffle/build/webpack:/~/xhr2-cookies/dist/xml-http-request.js:318:1) at IncomingMessage. (node_modules/truffle/build/webpack:/~/xhr2-cookies/dist/xml-http-request.js:289:47) at endReadableNT (_stream_readable.js:1094:12) at process._tickCallback (internal/process/next_tick.js:63:19)

The error is triggered on the await this.token1.safeTransferFrom(holder1, this.AS.address, transferAmount, _data)

The code called is the same as safeTransferFrom() in the ERC721 standard here called OCT. Also the AS contract correctly implements the onERC721Received() since its a contract.

require('web3');
const {BN} = require('openzeppelin-test-helpers');

const OCT = artifacts.require('OCT');
const Swap = artifacts.require('Swap');


contract('Swap & OCT', function ([_, holder1, holder2, recipient, anotherAccount]) {
    const initialSupply = new BN(100);
    const transferAmount = new BN(10);

    beforeEach(async function () {
      this.token1 = await OCT.new("OpsCoin", "OCT", 20, holder1, initialSupply);
      this.token2 = await OCT.new("OpsCoin", "OCT", 20, holder2, initialSupply);
      this.AS = await Swap.new();
    });
    describe('Atomic Swap', function () {
        describe('Deploy two uERC20 Contracts that empty their amounts into their owners accounts', function () {
            it('Return two contracts and their Supply', async function () {
                (await this.token1.totalSupply()).should.be.bignumber.equal(initialSupply);
                (await this.token2.totalSupply()).should.be.bignumber.equal(initialSupply);
            });
        });

        describe('Initiate the Swap', function () {
            it('Run the code for Atomic Swap by running safeTransferFrom()', async function () {
                //Encode the data into a bytes var so the safeTransferFrom can pass it over to the Swap Contract
                var _data = await web3.eth.abi.encodeParameters   (  
                    ['uint256','uint256','address','address','uint256','address'], 
                    ['1', transferAmount.toString(), holder2, this.token1.address, transferAmount.toString(), this.token2.address]
                );

                var data = await web3.eth.abi.encodeParameters   (  
                    ['uint256', 'uint256','address','address','uint256','address'], 
                    ['1', transferAmount.toString(), holder1, this.token2.address, transferAmount.toString(), this.token1.address]
                );

                //Send the tokens to the ASContract triggering the lead of the swap
                await this.token1.safeTransferFrom(holder1, this.AS.address, transferAmount, _data)

            });
        });
    });
})

I realise this is a heavy and difficult question but Ill be very grateful to whom ever can fix it

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